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If you don't want quality, I'd say any photo shop could come up with that for you. There are professional shops who can deliver the quality. We used a couple in Taipei, but it's been too many years to remember them now. Well, hell, I guess this post isn't much help. Sorry. But it shouldn't be too hard to find something.

I had a photo blown up to a small, 16" x 20" poster a couple of weeks ago at the neighbourhood photo shop. It turned out ok. If you want larger... I'm not sure. Let me know if you find someone that does a good job.

I assume - without knowing a lot - that quality is mostly down to how many pixels per cm or inch or whatever you blow the image up to. Need to figure out what the acceptable minimum would be before it starts to look crappy. In this case, it's a map of Ankh Morpock, not a photo. And another of the discworld.

I was asked for 300dpi for some printing recently. If you could get away with half that (not sure if you can) then 150dpi for an image 4500 pixels across gives me 30 inches. Converting archaic to modern, that works out at about 75cm.

But do theses average print stores have printing machines that can do larger prints?

300dpi is fairly standard for printing. Certainly it will look fine to the naked eye. 150dpi is about as low as you could possibly go before it looks like total arse.

You should be aware that if you go down to 150, there are two things that can happen. Either it will look a bit blurry, or it will look a bit pixelated, depends on the process involved. I'd recommend the blurry approach. If you send it to lupillus, I'm sure she'll sort you would with the best possible image.

Presumably I could ask them to test print a sample at each different resolution and then decide what I want after I've seen how it looks. That much doesn't sound difficult.

The question is, if I want something 28 of those inch things across, would they have a printer that could handle it? If they have a xerox machine that big then presumably - in this modern day and age - it can be connected to a computer and will just print my file in one piece without me having to cut and paste anything.

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